Kinetic resolution of 1-oxyl-3-hydroxymethyl-2,2,5,5-tetramethylpyrrolidine derivatives by lipase-catalyzed enantiomer selective acylation
作者:József Bálint、Violetta Kiss、Gabriella Egri、Tamás Kálai、Ádám Demeter、Mária Balog、Elemér Fogassy、Kálmán Hideg
DOI:10.1016/j.tetasy.2003.12.026
日期:2004.2
By recrystallization and/or re-esterification each molecule was produced in very high enantiomeric purity. The resolved 1-oxyl-3-hydroxymethyl-2,2,5,5-tetramethylpyrrolidine alcohols were converted to methanethiosulfonate spin labels, 1-oxyl-3-methanesulfonylthiomethyl-2,2,5,5-tetramethylpyrrolidines. Enantiomeric purities have been determined by the 19F NMR method of the respective Mosher esters.
已通过生物催化拆分了三个含有羟甲基的手性稳定自由基。通过重结晶和/或再酯化,以非常高的对映体纯度产生了每个分子。将溶解的1-氧基1-3羟甲基-2,2,5,5-四甲基吡咯烷醇转化为甲硫基磺酸盐自旋标记,即1-氧基1-3甲磺酰基硫基甲基-2,2,5,5-四甲基吡咯烷。对映体纯度已经通过各个Mosher酯的19 F NMR方法确定。通过比较Mosher酯的化学位移以及通过比较使用相同酶制剂获得的比旋光度来指定绝对构型。